Question

A man weighing 65 kg lifts a trunk of mass 45 kg to the top of a building 10 m
high in 1minute. His power is
A) 72 W
B) 180 W
C) 90 W
D) 62.6 W​

Answer 1

Answer:

answer is 180W

Explanation:

given :

mass of man = 65kg, take g= 9.81 m/sec

mass of trunk= 45kg, total mass = 65+45=110kg

time= 1min= 60 sec

power= mgh/t

on solving

p= 110*9.81*10/60

p= 179.85 = 180 W